Socket carbon-brush holder.



No. 686,|62. Patented Nov. 5, IQOI.

0. M. STIEGLER.

SOCKET CARBON BBUSH'HOLDER. Application filed Mar. 15, 1901.)'

(.No Model.)

FIG. 2. FIG. 6.

- -\J, EB

If G. 5 If G. 7.

WITNESSES: INVENTOR.

"m2 norms PETERS co. PHOYO-L|}"Hi).. wpsnmurou. o. c.

UNITED STATES PATENT OFFICE.

OSCAR M. STIEGLER, OF BOSTON, MASSACHUSETTS.

SOCKET CARBON-BRUSH HOLDER.

SPECIFICATION forming part of Letters Patent No. 686,162, dated November5, 1901.

Application filed March 15, 1901. Serial No. 51,255. (No model.)

To all whom it may concern:

Be it known that I, OSCAR M. STIEGLER, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain 'new and useful improvements in socketcarbon=brush holders used on electric dynamos and motors for the purposeof carrying the electric current, of which the following is aspecification.

The objects of my invention are, first, to have sufiicient contactbetween the carbon brush and the brush-holder without the separateconnection as usually used for the purpose of contact in connection withother socket carbon-brush holders now in use; second, to be able to takethe carbon brush from the brush holder without moving the brushholderfrom its position; third, to be able to adjust the brush-holder to thevariations in width of carbon brushes. With these objects in View theconstruction of my invention consists of a metal casting, called thehead, two parts of sheet metal bent into shape so as to form an opensocket, and a pressure-arm which can easily be removed from the pin inwhich it swings. A

My invention consists also in certain details of construction, as willbe more fully described, and pointed out in the claims,referencebeinghad to the accompanying drawings.

Figure 1 is a side View of the entire socket carbon-brush holder. Fig. 2is a top View. Fig. 3 is a top view of head A and the formed socket N,showing position of B B when the carbon brush is removed. Figs. 4, 5, 6,and 7 are detailed parts.

Referring to Fig. 1, A is the head a metal casting. Parts 13 B are madeof sheet metal bent into shape so as to form an open socket for thecarbon brush H when attached to the head A by screws m, as shown inFigs. 2 and 3. Parts B 13 form a half-circle at point 0 for the purposeof creating a greater resiliency. Contact between the carbon brush H andthe brush-holder is had by the constant pressure of B B upon the sidesof the carbon brush H, each acting as a spring. 0 is the pressure-arm,by which the carbon brush H is pressed against the commutator,represented by circular line Q. The pressure-arm C is connected tospring D by tension-screw F. Spring D is attached to head A by screws Z.E is the tension-nut, by which the pressure upon the carbon brush H isregulated. G is a washer, made of an oblong sheetmetal punching, with arectangular oblong hole in the center bent into shape so as to form twoelevated points on one side and a flat surface on the opposite side ofthe two points, leaving a square hole through the center. The two pointsrest in groove 3' in pressure-arm O and act as a fulcrum, while the flatsurface acts as a washer for tension-nut E, as shown in Fig. 1.

Fig. 2 is a top view of the brush-holder, and shows position of B B tobe rectangular when the carbon brush H is in position. I

Fig. 3 shows position of B B when carbon brush H is removed.

Fig. 4: is a perspective View of head A, showing recess P, into whichparts B B are screwed, thus forming the socket N, as shown in Fig. 3.

Fig. 5 is a side View of pressure-arm O. 1' shows the hook shapedend,which hooks into pin K and is held in position by the pressure ofspring 1), as shown in Fig. 1. By unscrewing tension-nut E it can beremoved from its position and allows the carbon brush H to be taken fromthe socket.

Fig. 6 represents detailed views of washer G.

Fig. 7 represents detailed views of B.

I am aware that prior to my invention socket carbon-brush holders havebeen made with a similar spring and pressure-arm acting upon the carbonbrush in about the same I therefore do not claim such a con1- manner.bination broadly; but

What I do claim, and desire to secure by Letters Patent, is-

1. In socket carbon-brush holders the com bination of a cast head andtwo parts of sheet metal bent into shape so as to form an open socketfor the carbon brush, when attached to said head, substantially asdescribed.

2. In a device, the combination of a cast head and two parts of sheetmetal bent into shape so as to form an adjustable socket, when attachedto said head.

3. Washer G, an oblong-shaped sheet-metal punching with a rectangularoblong hole in the center, bent into shape so as to form two elevatedpoints on one side and a fiat surface on the opposite side of the twopoints, leav ing a square hole through the center, as described and itspurpose set forth.

OSCAR M. STIEGLER.

Witnesses:

FREDERICK A. SUCK, ARTHUR. R. SANBORN.

